Force Fundamentals

What is friction?

• Friction is the force that attracts objects.

• Friction is the force that generates light.

• Friction is the force that resists motion.

• Friction is the force that accelerates motion.

How does friction affect the motion of an object?

• Friction changes the color of an object

• Friction accelerates the motion of an object

• Friction has no effect on the motion of an object

• Friction opposes the motion of an object by acting in the opposite direction.

Explain the difference between static and kinetic friction.

• Static friction is the frictional force between two objects moving at different speeds, whereas kinetic friction is the frictional force between two objects moving at the same speed.

• Static friction is the frictional force between two objects in motion, and kinetic friction is the frictional force between two objects at rest.

• Static friction is the frictional force between two objects in motion, whereas kinetic friction is the frictional force between two objects at rest.

• Static friction is the frictional force between two objects at rest, whereas kinetic friction is the frictional force between two objects in motion.

What factors affect the amount of friction between two surfaces?

• Nature of materials, roughness of surfaces, amount of force, presence of lubricants

• Color of the surfaces, Temperature, Time of day

Define normal force.

• The normal force is the force of gravity acting on an object.

• The normal force is the force exerted by an object to lift another object.

• The normal force is the force exerted by an object to push another object away.

• The normal force is the force exerted by a surface to support the weight of an object resting on it.

How is normal force related to the weight of an object?

• The normal force is perpendicular to the weight of an object.

• The normal force is equal in magnitude but opposite in direction to the weight of an object.

• The normal force is greater than the weight of an object.

• The normal force is unrelated to the weight of an object.

In which direction does the normal force act on an object resting on a surface?

• Downwards

• Sideways

• Upwards

• Diagonally

How does the normal force change when an object is on an inclined plane?

• The normal force becomes negative

• The normal force increases

• The normal force remains constant

• The normal force decreases

Explain how normal force and gravitational force interact on an object on a flat surface.

• The normal force is greater than the gravitational force on a flat surface

• The gravitational force is perpendicular to the normal force on a flat surface

• The normal force and gravitational force cancel each other out on a flat surface

• The normal force and gravitational force are equal in magnitude and opposite in direction on an object on a flat surface.

What is the relationship between normal force and friction?

• Friction force is directly proportional to the normal force.

• Friction force is equal to the normal force.

• Normal force has no effect on friction.

• Friction force is inversely proportional to the normal force.